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Donaldson, who sprained his right ankle against Florida State, was listed on the report as having a “lower extremity” injury. His replacement in that game, and Saturday’s against Georgia Tech (3:30 p.m., ABC), is fellow true freshman Corey Gaynor. The new backup right guard would be either redshirt junior Jahair Jones or redshirt sophomore Hayden Mahoney. Gaynor is also the backup center, behind Tyler Gauthier.

Delaney, who officially has a “lower extremity” injury, was seen at Tuesday’s practice wearing a brace on his right knee, while not using his right leg to pedal a stationary bike. The grad transfer from The Citadel recorded his first FBS interception against FSU. His absence means more work for freshman Trajan Bandy and junior Michael Jackson, and likely, fellow transfer Jhavonte Dean. Bandy or Jackson would likely start in Delaney’s place opposite Malek Young. The latter had an interception against the Seminoles.

Dean, defensive coordinator Manny Diaz said, is “getting better and better” after struggling with “some physical things” in camp. “In my experience, guys coming in from junior college are always better the last six games of their first season than the first six games.”

Redwine — “upper extremity” on the school-issued report — left last week’s game after a third-quarter tackle on FSU running back Cam Akers. The junior returned to the sideline in street clothes. Robert Knowles is the likely starter, with Romeo Finley or Amari Carter as backups, alongside junior Jaquan Johnson. Redwine was also a valuable special-teams player, so UM will be looking for help there.

“You’re not going to really be prepared for it until you actually play in it,” Johnson said of Georgia Tech’s triple-option offense. “Once they get their feet wet in the game and something happens, they’ll come over to the sideline and relay what’s going on. From there it’ll work. For now, we’re practicing hard and watching film.”

Diaz wasn’t satisfied with his team’s assignment discipline or tackling against Florida State. Planning to stop Georgia Tech, he said, is “is exciting. It’s a great challenge for us.”

Richards, a sophomore and UM’s top wideout, has a balky hamstring dating to mid-camp (or, “lower extremity” in official parlance). He missed the first two games of the season and caught three passes for 106 yards and a touchdown against Duke on Sept. 29. He caught four balls for 68 yards last week in Tallahassee, but was “struggling,” according to coach Mark Richt. UM is hoping a group including Jeff Thomas, Mike Harley, Lawrence Cager and Darrell Langham can fill some of the void, should Richards not be able to play.

Miami is already without star running back Mark Walton, who will miss the rest of the year. He hurt his right ankle at FSU — as Duke Johnson did in 2013.

The Hurricanes are hoping sophomore Travis Homer can step up in Walton’s absence.

[…] Donaldson (sprained right ankle), Redwine (unknown) and Delaney (believed to be right knee or leg) are expected to return this season; it is unclear how much time they will miss. Click here for more on their injuries. […]